BIO 2 GAS EXCHANGE PLANTS Flashcards
is the process whereby
water vapor and oxygen leave, and
carbon dioxide enters plant leaves.
GAS EXCHANGE
Plants breathe through the
Stomata, lenticels, root hairs
are little openings (pores) found on
the lower epidermis of the leaf.
It is surrounded by guard cells, allowing the
plant to open and close the pores
STOMATA in LEAVES
the guard cells absorb
water by
Osmosis
In the dark, the guard cells lose
water, it becomes f____ and the
stoma closes.
flaccid
are spongy small
openings that are lens-
shaped
It does not perform
photosynthesis
remain open all
the time, day and night
LENTICELS IN BARK
Roots perform gaseous exchange
directly with the help of root hairs
by !!diffusion!! through their cell
membranes.
ROOT HAIR IN AERIAL ROOTS
Crucial to start photosynthesis.
- Bicarbonate ions are used as a substitute
when there is a low level of CO2.
Carbon dioxide is dissolved underwater
Movement of molecules from high concentration to low concentration
- In this case, how carbon dioxide is able to enter the stomata.
Diffusion
has a waxy leaf surface with stomata on one side facing up the surface
Aquatic Plants exposed to surface
has no waxy surface on the leaves, hence gas can diffuse to the
leaves directly to the cell membrane
Submerged Aquatic Plants
Spongy tissues where air is stored.
- Aids in keeping plants afloat.
AERENCHYMA
Root structures that
enable gaseous exchange in
plant roots.
PNEUMATODES
It is the movement or transport of water, minerals,
and nutrients within the plant.
WHAT IS TRANSPORT IN PLANTS?
It is responsible for transporting water and
minerals from the roots to the rest of the
plant.
XYLEM
Long hollow tubes arranged end
to end forming a continuous tube.
Similar function to Tracheid, also
provides mechanical strength to
the plant.
VESSEL
Elongated cells with tapered
ends. It transports water and
minerals for the plant.
T R A C H E I D
The primary function of this
structure is to provide
mechanical strength and
support to the plant.
X Y L E M F I B E R
Elongated cells with tapered ends. It
transports water and minerals for the
plant.
X Y L E M
P A R E N C H Y M A
Moves sugar that the plant has produced by photosynthesis to where it is needed.
PHLOEM
is the movement of sugars and nutrients through the phloem.
TRANSLOCATION
